Question: Emily likes pretzels and pepsi. She bought 10 bottles of Pepsi for $2 each. Her marginal utility for the tenth bottle was 12 utils. She also bought 7 bags of pretzels for $4 per bag. Her marginal utility for the seventh bag was 20 utils. Assume Emily exhausted her budget on this purchase of Pepsi and pretzels, but wanted to maximize her utility. Would she have been better off buying more Pepsi and fewer pretzels, more pretzels and less Pepsi, or was her purchase already optimal? Are pretzels and Pepsi complements or substitues to Emily?